The MTS Model 685.53 Grip Control Unit accurately controls pressure to hydraulic grips. Each grip can be actuated independently. The kit includes the grip control unit, hydraulic hoses to the hydraulic power supply, hydraulic hoses to the grips, and a universal mounting bracket. The control unit requires 21 MPa (3,000 psi) input pressure and can control the pressure to the grips from 0.7 MPa to 20 MPa (100 psi to 3,000) psi with a resolution of ±0.07 MPa (±10 psi). This range and resolution allow the user to select the proper grip pressure so it holds the specimen sufficiently without damaging it. The stability of the controlled pressure is ±0.5 MPa (±25 psi) yielding no extraneous load fluctuations within your test. The clamping speed of the grips is also adjustable.